DOI: 10.1016/j.watres.2018.07.041
Scopus记录号: 2-s2.0-85053126916
论文题名: Impact of gas injection on physicochemical properties of waste activated sludge: A linear relationship between the change of viscoelastic properties and the change of other physiochemical properties
作者: Bobade V. ; Evans G. ; Baudez J.C. ; Eshtiaghi N.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 246
结束页码: 253
语种: 英语
英文关键词: Soluble COD
; Suspended solids
; Viscoelastic properties
; Waste activated sludge
; Zeta potential
Scopus关键词: Biodegradation
; Energy utilization
; Flow of gases
; Gases
; Viscoelasticity
; Zeta potential
; Physicochemical property
; Physio-chemical properties
; Soluble COD
; Suspended solids
; Total energy consumption
; Total suspended solids
; Viscoelastic properties
; Waste activated sludges
; Activated sludge process
; activated sludge
; aeration
; biodegradation
; chemical oxygen demand
; chemical reaction
; energy use
; physicochemical property
; suspended load
; viscoelasticity
; water treatment
英文摘要: Aeration process in the waste activated sludge treatment accounts for 75% of total energy consumption of the treatment plant. The main purpose of the aeration process is to enhance the biodegradation of the liquid waste. Gas bubbles, rising through the liquid, improves mixing, reduces inhomogeneities in the treatment tank and enhances biological reactions. Thus aeration intensity and several physicochemical properties of feed such as viscosity, total suspended solids, and surface charge play a significant role in the biological reaction. This paper examines the impact of the gas injection rate on some physicochemical properties of waste activated sludge namely rheological properties, suspended solids, soluble COD (sCOD), surface tension, and zeta potential. The impact of four different gas flow rates on four different concentrations of waste activated sludge properties was analysed. The results showed that in linear viscoelastic regime the viscous and elastic modulus decreases linearly with an increase in gas flow rate. The amount of stress imposed by gas injection also showed a direct relationship with gas velocity. Gas injection also showed a substantial impact on soluble COD, suspended solids, and zeta potential. Additionally, a linear relationship was observed between the percentage change in the above mentioned physical properties and stress imposed by gas injection. These results confirm that gas injection produces additional shear impacting sludge physicochemical properties and therefore changes its rheological behaviour. The extra stress induced by gas injection can be predicted using a simple model based on sludge concentration and gas velocity. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112524
Appears in Collections: 气候减缓与适应
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作者单位: RMIT University, School of Civil, Environmental and Chemical Engineering, 124 La Trobe St, Melbourne, Vic 3000, Australia; School of Chemical Engineering, The University of Newcastle, Australia; LIST, Environmental Research and Innovation Department (ERIN), 41, rue du Brill, Belvaux, L-4422, Luxembourg
Recommended Citation:
Bobade V.,Evans G.,Baudez J.C.,et al. Impact of gas injection on physicochemical properties of waste activated sludge: A linear relationship between the change of viscoelastic properties and the change of other physiochemical properties[J]. Water Research,2018-01-01,144